Data for: 40Ar-39Ar step heating ages of North American tektites and of two impact melt rock samples from the Chesapeake Bay impact structure

Table A1 Summary of literature age data for NA Tektites and the Chesapeake Bay impact structure obtained using different analytical techniques: biostratigraphy, fission-track, 40Ar/39Ar total fusion and step heating, K/Ar and U/Pb. Where possible, sample ages have been corrected using the Steiger and Jäger (1977) decay constants and consistent monitor ages (Schwarz and Trieloff, 2007).
Table A2 Chemical composition for a profile along a bediasite obtained by electron microprobe (in wt%).
Table A3 Chemical composition for a profile along a georgiaite obtained by electron microprobe (in wt%).
Appendix tables A4-A20 display measured argon isotopes corrected for mass discrimination, sensitivity, system blanks, decay and relative neutron doses. All isotopes are also corrected for interfering isotopes produced on K and Ca during irradiation.

表A1展示了利用不同分析技术（生物地层学、裂变径迹、40Ar/39Ar总融合及阶梯加热、K/Ar和U/Pb）获得的北美Tektites和切萨皮克湾撞击结构文献年龄数据的概要：在可能的情况下，样本年龄已根据Steiger和Jäger（1977）的衰变常数以及一致的监控年龄（Schwarz和Trieloff，2007）进行了校正。表A2列出了通过电子探针（以重量百分比表示）获取的床iasite剖面化学成分。表A3展示了通过电子探针（以重量百分比表示）获取的georgiaite剖面化学成分。附录表A4-A20展示了校正了质量歧视、灵敏度、系统空白、衰变和相对中子剂量的测量氩同位素。所有同位素在辐照过程中产生的干扰同位素（在K和Ca上）也进行了校正。